Year % gross 1991 4.46404981613159 1994 5.22396993637085 1995 4.74231004714966 1997 4.24974012374878 1998 4.40544986724854 1999 5.31454992294312 2000 6.50696992874146 2001 8.17564964294434 2002 9.50177001953125 2003 9.19874000549316 2004 10.2137002944946 2005 10.9254903793335 2006 11.6163997650146 2007 12.6771802902222 2008 13.5023899078369 2010 12.6721601486206 2011 11.3039846420288 2012 12.937780380249 2013 13.2437391281128 2014 15.1810264587402 2015 16.2654914855957 2016 16.9801425933838 2017 18.3684215545654 2018 19.7497653961182 2019 20.7457962036133 2020 27.6979808807373 2021 34.4849433898926